This specification specifies the testing items, testing procedures, test methods and testing processes for lithium-ion battery systems for next-generation pure electric cars (hereinafter referred to as battery systems) to guide the testing of battery systems for next-generation pure electric cars. It provides a basis for the selection and rapid evaluation of power batteries for next-generation pure electric cars, as well as the design of battery systems. This specification applies to lithium-ion battery systems for pure electric passenger vehicles.